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4c039060 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/*
17$Log$
2d7a47be 18Revision 1.34 2001/11/27 13:13:07 morsch
19Maximum lifetime for long-lived particles to be put on the stack is parameter.
20It can be set via SetMaximumLifetime(..).
21
47fc6bd5 22Revision 1.33 2001/10/21 18:35:56 hristov
23Several pointers were set to zero in the default constructors to avoid memory management problems
24
2685bf00 25Revision 1.32 2001/07/27 17:09:36 morsch
26Use local SetTrack, KeepTrack and SetHighWaterMark methods
27to delegate either to local stack or to stack owned by AliRun.
28(Piotr Skowronski, A.M.)
29
a99cf51f 30Revision 1.31 2001/07/13 10:58:54 morsch
31- Some coded moved to AliGenMC
32- Improved handling of secondary vertices.
33
fff02fee 34Revision 1.30 2001/06/15 07:55:04 morsch
35Put only first generation decay products on the stack.
36
6ba00c52 37Revision 1.29 2001/03/27 10:58:41 morsch
38Initialize decayer before generation. Important if run inside cocktail.
39
771bbe45 40Revision 1.28 2001/03/09 13:01:41 morsch
41- enum constants for paramterisation type (particle family) moved to AliGen*lib.h
42- use AliGenGSIlib::kUpsilon, AliGenPHOSlib::kEtaPrime to access the constants
43
34f60c01 44Revision 1.27 2001/02/02 15:21:10 morsch
45Set high water mark after last particle.
46Use Vertex() method for Vertex.
47
d9ea0e3b 48Revision 1.26 2000/12/21 16:24:06 morsch
49Coding convention clean-up
50
675e9664 51Revision 1.25 2000/11/30 07:12:50 alibrary
52Introducing new Rndm and QA classes
53
65fb704d 54Revision 1.24 2000/10/18 19:11:27 hristov
55Division by zero fixed
56
919c2096 57Revision 1.23 2000/10/02 21:28:06 fca
58Removal of useless dependecies via forward declarations
59
94de3818 60Revision 1.22 2000/09/12 14:14:55 morsch
61Call fDecayer->ForceDecay() at the beginning of Generate().
62
00d6ce7d 63Revision 1.21 2000/09/08 15:39:01 morsch
64Handle the case fForceDecay=all during the generation, i.e. select all secondaries.
65
5ab0acc9 66Revision 1.20 2000/09/06 14:35:44 morsch
67Use AliDecayerPythia for particle decays.
68
fa480368 69Revision 1.19 2000/07/11 18:24:56 fca
70Coding convention corrections + few minor bug fixes
71
aee8290b 72Revision 1.18 2000/06/29 21:08:27 morsch
73All paramatrisation libraries derive from the pure virtual base class AliGenLib.
74This allows to pass a pointer to a library directly to AliGenParam and avoids the
75use of function pointers in Config.C.
76
b22ee262 77Revision 1.17 2000/06/09 20:33:30 morsch
78All coding rule violations except RS3 corrected
79
f87cfe57 80Revision 1.16 2000/05/02 07:51:31 morsch
81- Control precision of pT sampling TF1::SetNpx(..)
82- Correct initialisation of child-cuts in all constructors.
83- Most coding rule violations corrected.
84
749070b6 85Revision 1.15 2000/04/03 15:42:12 morsch
86Cuts on primary particles are separated from those on the decay products. Methods
87SetChildMomentumRange, SetChildPtRange, SetChildPhiRange, SetChildThetaRange added.
88
cc5d764c 89Revision 1.14 1999/11/09 07:38:48 fca
90Changes for compatibility with version 2.23 of ROOT
91
084c1b4a 92Revision 1.13 1999/11/04 11:30:31 fca
93Correct the logics for SetForceDecay
94
28337bc1 95Revision 1.12 1999/11/03 17:43:20 fca
96New version from G.Martinez & A.Morsch
97
886b6f73 98Revision 1.11 1999/09/29 09:24:14 fca
99Introduction of the Copyright and cvs Log
100
4c039060 101*/
102
fe4da5cc 103#include "AliGenParam.h"
fa480368 104#include "AliDecayerPythia.h"
fe4da5cc 105#include "AliGenMUONlib.h"
106#include "AliRun.h"
1578254f 107#include <TParticle.h>
fa480368 108#include <TParticlePDG.h>
109#include <TDatabasePDG.h>
110#include <TLorentzVector.h>
111
f87cfe57 112#include <TF1.h>
fe4da5cc 113
114ClassImp(AliGenParam)
115
116//------------------------------------------------------------
117
118 //Begin_Html
119 /*
1439f98e 120 <img src="picts/AliGenParam.gif">
fe4da5cc 121 */
122 //End_Html
123
124//____________________________________________________________
125//____________________________________________________________
126AliGenParam::AliGenParam()
fe4da5cc 127{
b22ee262 128// Deafault constructor
129 fPtPara = 0;
130 fYPara = 0;
34f60c01 131 fParam = 0;
132 fAnalog = kAnalog;
b22ee262 133 SetDeltaPt();
675e9664 134//
135// Set random number generator
136 sRandom = fRandom;
2685bf00 137 fDecayer = 0;
b22ee262 138}
139
fff02fee 140AliGenParam::AliGenParam(Int_t npart, AliGenLib * Library, Int_t param, char* tname):AliGenMC(npart)
b22ee262 141{
142// Constructor using number of particles parameterisation id and library
143
144 fPtParaFunc = Library->GetPt(param, tname);
145 fYParaFunc = Library->GetY (param, tname);
146 fIpParaFunc = Library->GetIp(param, tname);
147
148 fPtPara = 0;
149 fYPara = 0;
150 fParam = param;
34f60c01 151 fAnalog = kAnalog;
b22ee262 152 SetForceDecay();
b22ee262 153 SetDeltaPt();
675e9664 154//
155// Set random number generator
156 sRandom = fRandom;
fe4da5cc 157}
158
159//____________________________________________________________
886b6f73 160
fff02fee 161AliGenParam::AliGenParam(Int_t npart, Int_t param, char* tname):AliGenMC(npart)
fe4da5cc 162{
b22ee262 163// Constructor using parameterisation id and number of particles
164//
675e9664 165 AliGenLib* pLibrary = new AliGenMUONlib();
b22ee262 166
675e9664 167 fPtParaFunc = pLibrary->GetPt(param, tname);
168 fYParaFunc = pLibrary->GetY (param, tname);
169 fIpParaFunc = pLibrary->GetIp(param, tname);
b22ee262 170
171 fPtPara = 0;
172 fYPara = 0;
173 fParam = param;
34f60c01 174 fAnalog = kAnalog;
b22ee262 175 fChildSelect.Set(5);
176 for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
177 SetForceDecay();
178 SetCutOnChild();
179 SetChildMomentumRange();
180 SetChildPtRange();
181 SetChildPhiRange();
182 SetChildThetaRange();
183 SetDeltaPt();
fe4da5cc 184}
185
34f60c01 186AliGenParam::AliGenParam(Int_t npart, Int_t param,
886b6f73 187 Double_t (*PtPara) (Double_t*, Double_t*),
188 Double_t (*YPara ) (Double_t* ,Double_t*),
65fb704d 189 Int_t (*IpPara) (TRandom *))
fff02fee 190 :AliGenMC(npart)
886b6f73 191{
749070b6 192// Constructor
28337bc1 193// Gines Martinez 1/10/99
886b6f73 194 fPtParaFunc = PtPara;
195 fYParaFunc = YPara;
196 fIpParaFunc = IpPara;
28337bc1 197//
886b6f73 198 fPtPara = 0;
199 fYPara = 0;
200 fParam = param;
34f60c01 201 fAnalog = kAnalog;
886b6f73 202 fChildSelect.Set(5);
203 for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
204 SetForceDecay();
205 SetCutOnChild();
749070b6 206 SetChildMomentumRange();
207 SetChildPtRange();
208 SetChildPhiRange();
209 SetChildThetaRange();
210 SetDeltaPt();
886b6f73 211}
212
f87cfe57 213
214AliGenParam::AliGenParam(const AliGenParam & Paramd)
215{
216// copy constructor
217}
218
fe4da5cc 219//____________________________________________________________
220AliGenParam::~AliGenParam()
221{
749070b6 222// Destructor
fe4da5cc 223 delete fPtPara;
224 delete fYPara;
225}
226
227//____________________________________________________________
228void AliGenParam::Init()
229{
749070b6 230// Initialisation
fa480368 231
232 fDecayer = new AliDecayerPythia();
fe4da5cc 233 //Begin_Html
234 /*
1439f98e 235 <img src="picts/AliGenParam.gif">
fe4da5cc 236 */
237 //End_Html
238
749070b6 239 fPtPara = new TF1("Pt-Parametrization",fPtParaFunc,fPtMin,fPtMax,0);
240// Set representation precision to 10 MeV
241 Int_t npx= Int_t((fPtMax-fPtMin)/fDeltaPt);
242
243 fPtPara->SetNpx(npx);
244
245 fYPara = new TF1("Y -Parametrization",fYParaFunc,fYMin,fYMax,0);
246 TF1* ptPara = new TF1("Pt-Parametrization",fPtParaFunc,0,15,0);
247 TF1* yPara = new TF1("Y -Parametrization",fYParaFunc,-6,6,0);
b7601ac4 248
fe4da5cc 249//
250// dN/dy| y=0
749070b6 251 Double_t y1=0;
252 Double_t y2=0;
253
254 fdNdy0=fYParaFunc(&y1,&y2);
fe4da5cc 255//
256// Integral over generation region
749070b6 257 Float_t intYS = yPara ->Integral(fYMin, fYMax);
258 Float_t intPt0 = ptPara->Integral(0,15);
259 Float_t intPtS = ptPara->Integral(fPtMin,fPtMax);
260 Float_t phiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi();
34f60c01 261 if (fAnalog == kAnalog) {
749070b6 262 fYWgt = intYS/fdNdy0;
263 fPtWgt = intPtS/intPt0;
264 fParentWeight = fYWgt*fPtWgt*phiWgt/fNpart;
265 } else {
266 fYWgt = intYS/fdNdy0;
267 fPtWgt = (fPtMax-fPtMin)/intPt0;
268 fParentWeight = fYWgt*fPtWgt*phiWgt/fNpart;
269 }
fe4da5cc 270//
271// particle decay related initialization
00d6ce7d 272 fDecayer->SetForceDecay(fForceDecay);
fa480368 273 fDecayer->Init();
00d6ce7d 274
fe4da5cc 275//
fff02fee 276 AliGenMC::Init();
fe4da5cc 277}
278
279//____________________________________________________________
280void AliGenParam::Generate()
281{
28337bc1 282//
283// Generate 'npart' of light and heavy mesons (J/Psi, upsilon or phi, Pion,
284// Kaons, Etas, Omegas) and Baryons (proton, antiprotons, neutrons and
285// antineutrons in the the desired theta, phi and momentum windows;
286// Gaussian smearing on the vertex is done if selected.
cc5d764c 287// The decay of heavy mesons is done using lujet,
288// and the childern particle are tracked by GEANT
289// However, light mesons are directly tracked by GEANT
290// setting fForceDecay = nodecay (SetForceDecay(nodecay))
28337bc1 291//
771bbe45 292//
293// Reinitialize decayer
294 fDecayer->Init();
295//
28337bc1 296 Float_t polar[3]= {0,0,0}; // Polarisation of the parent particle (for GEANT tracking)
297 Float_t origin0[3]; // Origin of the generated parent particle (for GEANT tracking)
298 Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle
299 Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum
300 Float_t p[3], pc[3],
fff02fee 301 och[3]; // Momentum, polarisation and origin of the children particles from lujet
2d7a47be 302 Double_t ty, xmt;
fff02fee 303 Int_t nt, i, j;
fe4da5cc 304 Float_t wgtp, wgtch;
305 Double_t dummy;
09fd3ea2 306 static TClonesArray *particles;
fe4da5cc 307 //
fff02fee 308 if(!particles) particles = new TClonesArray("TParticle",1000);
fa480368 309
675e9664 310 static TDatabasePDG *pDataBase = new TDatabasePDG();
311 if(!pDataBase) pDataBase = new TDatabasePDG();
fe4da5cc 312 //
313 Float_t random[6];
28337bc1 314
315// Calculating vertex position per event
fe4da5cc 316 for (j=0;j<3;j++) origin0[j]=fOrigin[j];
aee8290b 317 if(fVertexSmear==kPerEvent) {
d9ea0e3b 318 Vertex();
319 for (j=0;j<3;j++) origin0[j]=fVertex[j];
fe4da5cc 320 }
d9ea0e3b 321
21aaa175 322 Int_t ipa=0;
fff02fee 323
28337bc1 324// Generating fNpart particles
21aaa175 325 while (ipa<fNpart) {
cc5d764c 326 while(1) {
fe4da5cc 327//
328// particle type
65fb704d 329 Int_t iPart = fIpParaFunc(fRandom);
fa480368 330 fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight;
675e9664 331 TParticlePDG *particle = pDataBase->GetParticle(iPart);
fa480368 332 Float_t am = particle->Mass();
333
65fb704d 334 Rndm(random,2);
fe4da5cc 335//
336// phi
337 phi=fPhiMin+random[0]*(fPhiMax-fPhiMin);
338//
339// y
2d7a47be 340 ty = TMath::TanH(fYPara->GetRandom());
fe4da5cc 341//
342// pT
34f60c01 343 if (fAnalog == kAnalog) {
fe4da5cc 344 pt=fPtPara->GetRandom();
345 wgtp=fParentWeight;
346 wgtch=fChildWeight;
347 } else {
348 pt=fPtMin+random[1]*(fPtMax-fPtMin);
349 Double_t ptd=pt;
350 wgtp=fParentWeight*fPtParaFunc(& ptd, &dummy);
351 wgtch=fChildWeight*fPtParaFunc(& ptd, &dummy);
352 }
353 xmt=sqrt(pt*pt+am*am);
2d7a47be 354 if (TMath::Abs(ty)==1.) {
355 ty=0.;
356 Fatal("AliGenParam",
357 "Division by 0: Please check you rapidity range !");
358 }
359
fe4da5cc 360 pl=xmt*ty/sqrt(1.-ty*ty);
361 theta=TMath::ATan2(pt,pl);
cc5d764c 362// Cut on theta
fe4da5cc 363 if(theta<fThetaMin || theta>fThetaMax) continue;
364 ptot=TMath::Sqrt(pt*pt+pl*pl);
cc5d764c 365// Cut on momentum
fe4da5cc 366 if(ptot<fPMin || ptot>fPMax) continue;
fff02fee 367//
fe4da5cc 368 p[0]=pt*TMath::Cos(phi);
369 p[1]=pt*TMath::Sin(phi);
370 p[2]=pl;
aee8290b 371 if(fVertexSmear==kPerTrack) {
65fb704d 372 Rndm(random,6);
fe4da5cc 373 for (j=0;j<3;j++) {
374 origin0[j]=
375 fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
376 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
377 }
378 }
28337bc1 379
380// Looking at fForceDecay :
cc5d764c 381// if fForceDecay != none Primary particle decays using
382// AliPythia and children are tracked by GEANT
28337bc1 383//
cc5d764c 384// if fForceDecay == none Primary particle is tracked by GEANT
385// (In the latest, make sure that GEANT actually does all the decays you want)
fe4da5cc 386//
fff02fee 387
34f60c01 388 if (fForceDecay != kNoDecay) {
28337bc1 389// Using lujet to decay particle
886b6f73 390 Float_t energy=TMath::Sqrt(ptot*ptot+am*am);
fa480368 391 TLorentzVector pmom(p[0], p[1], p[2], energy);
392 fDecayer->Decay(iPart,&pmom);
fe4da5cc 393//
cc5d764c 394// select decay particles
fa480368 395 Int_t np=fDecayer->ImportParticles(particles);
886b6f73 396 Int_t ncsel=0;
fff02fee 397 Int_t* pFlag = new Int_t[np];
398 Int_t* pParent = new Int_t[np];
399 Int_t* pSelected = new Int_t[np];
400 Int_t* trackIt = new Int_t[np];
401
402 for (i=0; i<np; i++) {
403 pFlag[i] = 0;
404 pSelected[i] = 0;
405 pParent[i] = -1;
406 }
407
6ba00c52 408 if (np >1) {
409 TParticle* iparticle = (TParticle *) particles->At(0);
fff02fee 410 Int_t ipF, ipL;
411 for (i = 1; i<np ; i++) {
412 trackIt[i] = 1;
6ba00c52 413 iparticle = (TParticle *) particles->At(i);
414 Int_t kf = iparticle->GetPdgCode();
fff02fee 415 Int_t ks = iparticle->GetStatusCode();
416// flagged particle
417
418 if (pFlag[i] == 1) {
fff02fee 419 ipF = iparticle->GetFirstDaughter();
420 ipL = iparticle->GetLastDaughter();
421 if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
422 continue;
423 }
424
425// flag decay products of particles with long life-time (c tau > .3 mum)
426
427 if (ks != 1) {
2d7a47be 428// TParticlePDG *particle = pDataBase->GetParticle(kf);
fff02fee 429
430 Double_t lifeTime = fDecayer->GetLifetime(kf);
2d7a47be 431// Double_t mass = particle->Mass();
432// Double_t width = particle->Width();
47fc6bd5 433 if (lifeTime > (Double_t) fMaxLifeTime) {
fff02fee 434 ipF = iparticle->GetFirstDaughter();
435 ipL = iparticle->GetLastDaughter();
436 if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
437 } else{
438 trackIt[i] = 0;
439 pSelected[i] = 1;
440 }
441 } // ks==1 ?
fe4da5cc 442//
443// children
47fc6bd5 444
fff02fee 445 if (ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll && trackIt[i])
6ba00c52 446 {
6ba00c52 447 if (fCutOnChild) {
fff02fee 448 pc[0]=iparticle->Px();
449 pc[1]=iparticle->Py();
450 pc[2]=iparticle->Pz();
451 Bool_t childok = KinematicSelection(iparticle, 1);
452 if(childok) {
453 pSelected[i] = 1;
6ba00c52 454 ncsel++;
455 } else {
456 ncsel=-1;
457 break;
458 } // child kine cuts
459 } else {
fff02fee 460 pSelected[i] = 1;
886b6f73 461 ncsel++;
6ba00c52 462 } // if child selection
463 } // select muon
464 } // decay particle loop
465 } // if decay products
466
886b6f73 467 Int_t iparent;
468 if ((fCutOnChild && ncsel >0) || !fCutOnChild){
469 ipa++;
21aaa175 470//
fff02fee 471// Parent
a99cf51f 472 SetTrack(0, -1, iPart, p, origin0, polar, 0, kPPrimary, nt, wgtp);
fff02fee 473 pParent[0] = nt;
a99cf51f 474 KeepTrack(nt);
fff02fee 475//
476// Decay Products
477//
478 for (i = 1; i < np; i++) {
479 if (pSelected[i]) {
480 TParticle* iparticle = (TParticle *) particles->At(i);
481 Int_t kf = iparticle->GetPdgCode();
482 Int_t ipa = iparticle->GetFirstMother()-1;
483
484 och[0] = origin0[0]+iparticle->Vx()/10;
485 och[1] = origin0[1]+iparticle->Vy()/10;
486 och[2] = origin0[2]+iparticle->Vz()/10;
487 pc[0] = iparticle->Px();
488 pc[1] = iparticle->Py();
489 pc[2] = iparticle->Pz();
490
491 if (ipa > -1) {
492 iparent = pParent[ipa];
493 } else {
494 iparent = -1;
495 }
a99cf51f 496 SetTrack(fTrackIt*trackIt[i], iparent, kf,
fff02fee 497 pc, och, polar,
498 0, kPDecay, nt, wgtch);
499 pParent[i] = nt;
a99cf51f 500 KeepTrack(nt);
fff02fee 501 }
886b6f73 502 }
28337bc1 503 } // Decays by Lujet
fff02fee 504
505 if (pFlag) delete[] pFlag;
506 if (pParent) delete[] pParent;
507 if (pSelected) delete[] pSelected;
508 if (trackIt) delete[] trackIt;
21aaa175 509 } // kinematic selection
28337bc1 510 else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons)
511 {
512 gAlice->
65fb704d 513 SetTrack(fTrackIt,-1,iPart,p,origin0,polar,0,kPPrimary,nt,wgtp);
28337bc1 514 ipa++;
515 }
fe4da5cc 516 break;
21aaa175 517 } // while
fe4da5cc 518 } // event loop
a99cf51f 519 SetHighWaterMark(nt);
fe4da5cc 520}
521
f87cfe57 522AliGenParam& AliGenParam::operator=(const AliGenParam& rhs)
523{
524// Assignment operator
525 return *this;
526}
527
fe4da5cc 528
529